Simple, elegant lab-created opal set in 925 Sterling silver with pave crystal. The 18 inch chain is Sterling silver with an adjustable slider ball. The first model is wearing light green and the second model is wearing blue-green. Sterling silver Lab-created opal Always protect your jewelry from household chemicals, harsh soaps, sunlight, and excessive heat and cold. Remove your jewelry when washing your hands and bathing. Apply perfume or hairspray before putting on your jewelry. Clean your jewelry using a soft jewelry cloth. Many common chemical products such as cleaning products, face washes, perfumes, hairsprays, nail polishes, hand sanitizers, hand lotions, gardening chemicals, and even excessive perspiration can damage jewelry. Avoid activities that use these products when wearing jewelry.